[CI] AzureBlobStoreRepositoryTests testDanglingShardLevelBlobCleanup failing

[alex-spies]

Build scan:
https://gradle-enterprise.elastic.co/s/5hm4i7kz2hmhe/tests/:modules:repository-azure:internalClusterTest/org.elasticsearch.repositories.azure.AzureBlobStoreRepositoryTests/testDanglingShardLevelBlobCleanup

Reproduction line:

./gradlew ':modules:repository-azure:internalClusterTest' --tests "org.elasticsearch.repositories.azure.AzureBlobStoreRepositoryTests.testDanglingShardLevelBlobCleanup" -Dtests.seed=22CD8CF0C1D93787 -Dtests.locale=es-SV -Dtests.timezone=America/Cordoba -Druntime.java=21

Applicable branches:
8.12

Reproduces locally?:
Didn't try

Failure history:
Failure dashboard for org.elasticsearch.repositories.azure.AzureBlobStoreRepositoryTests#testDanglingShardLevelBlobCleanup

Failure excerpt:

java.lang.AssertionError: State is not REQUEST (IDLE)

  at __randomizedtesting.SeedInfo.seed([22CD8CF0C1D93787]:0)
  at sun.net.httpserver.ServerImpl.requestCompleted(ServerImpl.java:1001)
  at sun.net.httpserver.FixedLengthInputStream.readImpl(FixedLengthInputStream.java:63)
  at sun.net.httpserver.LeftOverInputStream.read(LeftOverInputStream.java:99)
  at java.io.FilterInputStream.read(FilterInputStream.java:95)
  at org.elasticsearch.core.Streams.copy(Streams.java:45)
  at org.elasticsearch.core.Streams.copy(Streams.java:79)
  at org.elasticsearch.common.io.Streams.readFully(Streams.java:189)
  at fixture.azure.AzureHttpHandler.handle(AzureHttpHandler.java:95)
  at org.elasticsearch.repositories.blobstore.ESMockAPIBasedRepositoryIntegTestCase$HttpStatsCollectorHandler.handle(ESMockAPIBasedRepositoryIntegTestCase.java:371)
  at org.elasticsearch.repositories.blobstore.ESMockAPIBasedRepositoryIntegTestCase$ExceptionCatchingHttpHandler.handle(ESMockAPIBasedRepositoryIntegTestCase.java:407)
  at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:98)
  at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:82)
  at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:101)
  at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:871)
  at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:98)
  at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:847)
  at org.elasticsearch.repositories.blobstore.ESMockAPIBasedRepositoryIntegTestCase.lambda$startHttpServer$0(ESMockAPIBasedRepositoryIntegTestCase.java:104)
  at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:916)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  at java.lang.Thread.run(Thread.java:1583)

[elasticsearchmachine]

Pinging @elastic/es-distributed (Team:Distributed)

[pxsalehi]

The error seems related to the HTTP mock server that is used in the test. IMO, not a blocker.